12533640420 has 144 divisors (see below), whose sum is σ = 41433819840. Its totient is φ = 2822029056.

The previous prime is 12533640409. The next prime is 12533640421. The reversal of 12533640420 is 2404633521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (12533640421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165166 + ... + 228794.

It is an arithmetic number, because the mean of its divisors is an integer number (287734860).

Almost surely, 2^12533640420 is an apocalyptic number.

12533640420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12533640420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20716909920).

12533640420 is an abundant number, since it is smaller than the sum of its proper divisors (28900179420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12533640420 is a wasteful number, since it uses less digits than its factorization.

12533640420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63722 (or 63713 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 12533640420 in words is "twelve billion, five hundred thirty-three million, six hundred forty thousand, four hundred twenty".